| Method to reduce image sticking in plasma display panels -> Monitor Keywords |
|
|
  Method to reduce image sticking in plasma display panelsUSPTO Application #: 20070222711Title: Method to reduce image sticking in plasma display panels Abstract: The method to reduce image sticking in a plasma display panel (PDP) includes four steps. There is converting a relationship between gray level and brightness of an input signal into a linear relation by a converter. Next, there is recording an image with a static image detector at time t using a frame buffer, and after a period of time Δt, comparing the image at time t with the image at time t+Δt, thereby identifying static or dynamic images in the pixel. Then, there is recording a gain of every pixel by a brightness regulator using an image gains memory buffer zone, the gain being regulated according to detection results of the static image detector. Finally, there is improving gray level performance of output images by a gray level promoter and brightness converter. Thus, method actively detects static pixels and reduces brightness in the static region for minimized image sticking. (end of abstract) Agent: Egbert Law Offices - Houston, TX, US Inventors: Hsu-Pin Kao, Yi-Chia Shan, Tsan-Hung Tsai, Hsu-Chia Kao USPTO Applicaton #: 20070222711 - Class: 345063000 (USPTO) The Patent Description & Claims data below is from USPTO Patent Application 20070222711. Brief Patent Description - Full Patent Description - Patent Application Claims
RELATED U.S. APPLICATIONS [0001] Not applicable. STATEMENT REGARDING FEDERALLY SPONSORED RESEARCH OR DEVELOPMENT [0002] Not applicable. REFERENCE TO MICROFICHE APPENDIX [0003] Not applicable. FIELD OF THE INVENTION [0004] The present invention relates generally to a method to reduce image sticking in plasma display panels. More particularly, the invention allows active detection of static pixels in images and reduction of brightness for minimized image sticking. BACKGROUND OF THE INVENTION [0005] The Plasma Display Panel (PDP) is a currently mainstream, large-sized, and thin-profile display panel featuring a bigger frame, higher quality, a wider visual angle and lower radiation. However, the Plasma Display Panel (PDP) still faces the problem of image sticking, wherein image retention takes place after a static image is displayed on a PDP for a certain period of time. As illustrated in FIG. 1, when a Plasma Display Panel 10 highlights the font of "PDP" 20A, and then becomes a dark display (FIG. 2) and then a white display (FIG. 3), the image retention of PDP will take shape, forming aforementioned image sticking 20B, 20C. [0006] Therefore, this industry has developed several solutions to address image sticking of Plasma Display Panel (PDP) as detailed herein. [0007] Image Shifting [0008] The static image shifts leftward, rightward, upward and downward by a few pixels every several seconds or minutes, thereby avoiding fixation at a certain location. However, this method has poor performance, owing to the fact that only a few pixels shift by this method. Otherwise, the user can easily notice the dithering of images or shifting beyond the boundary. As shown in FIG. 1, since the font size of "PDP" represents a wide area of pixels, a limited pixel shift cannot bring the original font of "PDP" into a completely dark region. Thus, image sticking cannot be affected by the image shifting method as shown in FIG. 1. [0009] Gray Level Image Reversal [0010] Gray level reversal is applied to enable an entire screen of a Plasma Display Panel (PDP) to be highlighted equally for showing a uniform feature and lower image sticking. As shown in FIG. 1, after the font of "PDP" is highlighted for a period of time, the image of the same font with a white background and black character is also highlighted. Thus, difference in highlighting the pixels is averaged by the panel to reduce image sticking. This method, however, has the following limitations: [0011] a. Unable to identify accurately gray level reversal time. Prolonged image reversal will likely lead to image sticking at the other direction; and [0012] b. Unable to generate gray level reversal images of a static display. For example, if "Bshi TV" is broadcast live, the font of "Bshi" will appear at an upper right corner for a long time, where image sticking of "Bshi" will take place. In such case, it is unlikely to generate gray level reversal images of "Bshi" font to reduce image sticking. [0013] White Bar Image Removal [0014] When white bars run vertically or horizontally, it is possible to remove image sticking in a similar way as a screen wiper. However, striped images will occur on the display, leading to discomfort of the users. [0015] All-White Display Heating [0016] This method enables all images to be displayed uniformly. However, this method generally requires a long-lasting heating process, and also leads to unsatisfactory result in this regard. [0017] Thus, to overcome the aforementioned problems of the prior art, it would be an advancement in the art to provide an improved structure that can significantly improve efficacy. [0018] To this end, the inventor has provided the present invention of practicability after deliberate design and evaluation based on years of experience in the production, development and design of related products. BRIEF SUMMARY OF THE INVENTION Continue reading... Full patent description for Method to reduce image sticking in plasma display panels Brief Patent Description - Full Patent Description - Patent Application Claims Click on the above for other options relating to this Method to reduce image sticking in plasma display panels patent application. ###  How KEYWORD MONITOR works... a FREE service from FreshPatents1. Sign up (takes 30 seconds). 2. Fill in the keywords to be monitored. 3. Each week you receive an email with patent applications related to your keywords. Start now! - Receive info on patent apps like Method to reduce image sticking in plasma display panels or other areas of interest. ### Previous Patent Application: Method of driving plasma display panel Next Patent Application: Method and apparatus for driving ac plasma display panel with four electrodes Industry Class: Computer graphics processing, operator interface processing, and selective visual display systems ### FreshPatents.com Support Thank you for viewing the Method to reduce image sticking in plasma display panels patent info. IP-related news and info Results in 3.11968 seconds Other interesting Feshpatents.com categories: Daimler Chrysler , DirecTV , Exxonmobil Chemical Company , Goodyear , Intel , Kyocera Wireless , |
||
